bbPress.org

Ah that’s good!

That means you only need meta information for each Topic… that’s a lot easier to pull off than having meta information for each Post. At least, that was true in 0.9… I think bbPress 1.0 has changed how it handles meta data.

Anyway, you should be able to pretty easily commission a plugin to add an extra field to Topic Meta… it’s definitely technically possible, but a plugin to do this doesn’t yet exist.